We use the spectral-element method to simulate ground motion generated by two recent and well-recorded small earthquakes in the Los Angeles basin. Simulations are performed using a new sedimentary basin model that is constrained by hundreds of petroleum-industry well logs and more than 20,000 km of seismic reflection profiles. The numerical simulations account for 3D variations of seismic-wave speeds and density, topography and bathymetry, and attenuation. Simulations for the 9 September 2001 M_w 4.2 Hollywood earthquake and the 3 September 2002 M_w 4.2 Yorba Linda earthquake demonstrate that the combination of a detailed sedimentary basin model and an accurate numerical technique facilitates the simulation of ground motion at periods of 2 sec and longer inside the basin model and 6 sec and longer in the regional model. Peak ground displacement, velocity, and acceleration maps illustrate that significant amplification occurs in the basin.
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机译：我们使用频谱元素方法来模拟由洛杉矶盆地最近两次记录良好的小地震产生的地震动。使用新的沉积盆地模型进行模拟，该模型受数百个石油工业测井记录和超过20,000 km的地震反射剖面约束。数值模拟说明了地震波速度和密度，地形和测深法以及衰减的3D变化。 2001年9月9日好莱坞M_w 4.2地震和2002年9月3日Yorba Linda M_w 4.2地震的模拟表明，详细的沉积盆地模型和精确的数值技术相结合，可以方便地模拟2秒或更长时间内的地面运动。盆地模型，区域模型则需要6秒或更长时间。峰值地面位移，速度和加速度图表明，盆地中发生了明显的放大。
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